#! /usr/bin/env python

import os
import openturns as ot

ot.PlatformInfo.SetNumericalPrecision(6)

vertices = []
vertices.append([0.0, 0.0, 0.0])
vertices.append([0.0, 0.0, 1.0])
vertices.append([0.0, 1.0, 0.0])
vertices.append([0.0, 1.0, 1.0])
vertices.append([1.0, 0.0, 0.0])
vertices.append([1.0, 0.0, 1.0])
vertices.append([1.0, 1.0, 0.0])
vertices.append([1.0, 1.0, 1.0])

simplicies = []
simplicies.append([0, 1, 2, 4])
simplicies.append([3, 5, 6, 7])
simplicies.append([1, 2, 3, 6])
simplicies.append([1, 2, 4, 6])
simplicies.append([1, 3, 5, 6])
simplicies.append([1, 4, 5, 6])

mesh3D = ot.Mesh(vertices, simplicies)

s = 3
values = ot.Normal(s).getSample(mesh3D.getVerticesNumber())
field = ot.Field(mesh3D, values)
tree = ot.KDTree(vertices)
print("field=", field)
print("input dim=", field.getInputDimension())
print("value[4]=", field.getValueAtIndex(4))
print("value[4, 0]=%.6g" % field[4, 0])
print("nearest[2]=", field.getValueAtIndex(tree.query(field[2])))
print("mesh=", field.getMesh())
print("input mean=", field.getInputMean())
print("norm=%.6g" % field.norm())
print("deformed=", field.asDeformedMesh())
print("description=", field.getDescription())

fname = "field.vtk"
field.exportToVTKFile(fname)
with open(fname) as f:
    data = f.read()
    print(data)
os.remove(fname)

scalarField = ot.Field(mesh3D, ot.Sample(len(vertices), [1.0]))
print("deformed with complement=", scalarField.asDeformedMesh([1], [0, 2, 3]))
